Device for lubricating pneumatic tools



l O. VETTER DEVICE FOR LUBRICATING PNEUMATIC TOOLS Filed March 6, 1924 figg- CL2/M WW,

Patented Nov. 2719, i927.

STA TES i omro WETTER, nr encarcelar, enana-NY.

, f lnnvron `non Lunnrca'rriter PN-EUMATIC moons.

Application ined Marche, 1924. seria-1 no. 697,375.

The present invention relates to a device for lubricating` pneumatic tools, which device in spite of the lhigh percussion and rotational vspeeds of such tools, ensures `continuous and perfect lubrication, andalso enables the amount of lubricant supplied to be regulated to some extent. Wh-creaslthe devices of this kind hitherto in 'use/are built into the tool itself and therefore Iarecnly applicable when new tools are being .constructed, the subject of the present invention-which is also distinguished byyits simplicity and perfect working-can be intro-` duced independently into the `compressed air pipe concerned-a point of special importance 4in the case vof all existing pipes: By means of this device an ample and controllable quantity of lubricant can lthen be lcontinually exposed to the flow vof compressed air, which transports'itto `the place to be lubricated. i

The essence of the invention consists in that a certain quant-ity of the lubricant can be drawn out that is mechanically tra-nsported or carried out of a storage vessel by means of a movable member, for example a kind of piston, and by the displacement of this member is positively delivered into the current of compressed air, which then draws it away and carries it onward. rllhe member is operated by hand, by pushing a wedge or cam under its head, this displacement of the piston being effected by moving the casing of the device. This movement may be axial, rotary or a combination of the two movements.l

rlhe subject of the present invention is illustrated in typical embodiments in the drawing,

Fig. l is an external view of one embodiment of the device.

l? ig. 2 is an axial section of same.

Figs. 3 and 4l are cross sections with the piston pushed home and drawn out.

Fig. 5 is an elevation of another embodiment. K

rlhe body b of the device according to the present invention is attached to the compressed-air pipe a and contains a chamber c for the lubricant.

Adjoining this chamber c is a member for example a kind of piston CZ, which, in the example shown, is mounted with its axis lying radially and is designed to be moved in a radial direction. This piston serves to transfer the lubricant into the compressedair passage e. The piston Z 'might'equally be adapted to 4move in another direction, for instance axially. VFor this purpose,'the vessel 0 containing the lubricant is connected by means of a passagef with the path of the piston d, the latter being provided with a recess g. Onthe piston Z being pushed forward, lthe lubricant 7is conveyed thereby into the current .of ycompressed air which draws it` awaey and carries it onward. i l .The Vdisplacement of the ,piston cl is effected and rendered controlla ble by pushing alwedge or cam under the head /L ofthe piston d. The further the raised 'portion of the wedge or cam penetrates under 'the head '/L, the further is the piston alpushed lforward, and therefore the larger the quantity of lubricant rendered available to the compressed-air current. On the wedge ibeing drawn back again, .the 'piston spring/a automatically the piston.

The .movementof the wedge or cam z' can be effected in any convenient manner, "but, in any event, the casingZ of the device is employed for this purpose. In the embodiment shown in Fig. l the casing Z is twisted round and at the same time describes an axial movement, an oblique or spiral guide slot n being` provided in the sleeve m of the casing, in which slot engages a fixed pin o on the compressed-air pipe a. The casing Z is subjected to the action of a spring p, which, on lthe casing being released, turns it back automatically into its normal position.

The casing might equally well be arranged to describe a rotational movement alone, or also merely an axial movement in which latter case the slot n is given an axial position.

I claim l. A device for admitting lubricant to the column of fluid flowing in a conduit comprising, in combination with said' conduit, an oil reservoir and an oil pump including a chamber communicating with the inside of said conduit and with said reservoir, and a mechanically actuated piston in said chamber for displacing a quantity of lubricant from said reservoir and delivering it into said conduit independently of pressure lin said conduit, said piston acting as a cut-olf valve to said reservoir upon the discharge stroke of said piston.

2. A device for admitting lubricant to the edects Vthe return stroke of column of fluid flowing in a conduit, comprising, in combination with said conduit, an oil reservoir, and an oil pump including a chamber communicating with the inside or' said conduit and with said reservoir, a mechanically actuated spring-returned piston in said chamber for displacing a quantity of lubricant from said reservoir and delivering it to said conduit independently of pressure in said conduit, said piston acting as a cut-off valve to said reservoir upon the discharge stroke of said piston, and means for positively actuating said piston against the pressure of said sprinr.

3. A device for admitting lubricant to the column of fluid flowing in a conduit comprising, a member forming an oil reservoir surrounding said conduit, an oil pump, including a ciamber communicating with the inside of said conduit and with said reservoir, anda piston in said chamber for forcin lubricant into said conduit, and a movab e casing surrounding said reservoir havino' means engageable with said piston when said casing is moved for depressing said piston.

4. A device for admitting lubricant to the column of duid iowing in a conduit comprising a member forming an oil reservoir surrounding said conduit, an oil pump including a chamber communicating with the inside of said conduit and with said reservoir, and a piston in said chamber for forcing lubricant into said conduit, said piston acting as a cut-off to said reservoir upon the discharge stroke of said piston, a reciprocable casing surrounding said reservoir having means engageable with said piston when said casing is moved in one direction for depressing said piston and a spring within said casing for returning it when released to its normal position.

5. A device for admitting lubricant to the column of fluid flowing in a conduit comprising a member forming an oil reservoir surroundinor said conduit, an oil pum) including a ciliamber communicating with the inside of said conduit and with said reservoir, and a piston in said chamber for forcing lubricant into said conduit, said piston acting as a cut-o valve to said reservoir upon a discharge stroke of said piston, and a reciprocable casing surrounding said reservoir having means engageable with said piston for depressing the latter, said casing and member having a pin and slot connection for transforming a rotating motion applied to said casing to a reciprocatory movement for depressing said piston, and a spring Within said easing for returning it to normal rcleased position.

In testimony whereof I affix my signature.

OTTO VETTER. 

